#define _CRT_SECURE_NO_WARNINGS 1
#include "string.h"
using namespace std;
namespace zkf
{
	void test1()
	{
		string s1("2222222");
		string s2 = s1;
		string s3("111111111");
		s3 = s1;
		cout << s1.std() << endl;
		cout << s2.std() << endl;
		cout << s3.std() << endl;
	}
}
int main()
{
	zkf::test1();
	return 0;
}